A telecommunications network (10) includes a gateway (18) receiving signaling information in a media gateway and call session control format from a class #5# 5 softswitch (26). The gateway (18) converts the media gateway and call session control format to a broadband loop emulation service signaling protocol for transfer to integrated access devices (20) at a customer premises (22) through a broadband loop emulation services network (14). The gateway (18) also receives signal information in a broadband loop emulation service signaling protocol from the integrated access devices (20) through the broadband loop emulation services network (14). The gateway (18) converts the broadband loop emulation service signaling protocol to the media gateway and call session control format for transfer to the class 5 softswitch (26). The class 5 softswitch (26) places the media gateway and call session control format into a network signal format for transfer over a signaling network (24).
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14. A method for interfacing between signaling protocols, comprising:
#5# at a gateway:
receiving signaling information in a media gateway and call session control format from a class 5 softswitch;
converting the signaling information received from the class 5 softswitch in the media gateway and call session control format to signaling information in a broadband loop emulation service signaling protocol format and providing the signaling information in the bles signaling protocol format over a bles network;
providing capabilities for services over the bles network including dial tone generation, hook flash detection, caller identification generation, digit collection, call progress tones, and tone detection capabilities; and
determining which of the services the gateway is to perform in response to instructions received from the class 5 softswitch through the signaling information in the media gateway and call session control format and providing the services over the bles network as instructed by the class 5 softswitch and wherein the media gateway and call session control format is a format usable by a media gateway controller to control a media gateway.
21. A computer readable medium having stored thereon executable instructions that when executed by a processor of a computer control the computer to perform steps comprising:
#5# at a gateway:
receiving signaling information in a media gateway and call session control format from a class 5 softswitch;
converting the signaling information received from the class 5 softswitch in the media gateway and call session control format to signaling information in a broadband loop emulation service bles signaling protocol format;
providing the signaling information in the bles signaling protocol format over a bles network;
providing capabilities for services over the bles network including dial tone generation, hook flash detection, caller identification generation, digit collection, call progress tones, and tone detection capabilities; and
determining which of the services the gateway is to provide over the bles network in response to instructions received from the class 5 softswitch through the signaling information in the media and call session control format and providing the services over the bles network as instructed by the class 5 softswitch and wherein the media gateway and call session control format is a format usable by a media gateway controller to control a media gateway.
1. A system for interfacing between signaling protocols, comprising:
#5# a gateway having a first interface for communicating with a class 5 softswitch and that is operable to receive, from the class 5 softswitch, signaling information in a media gateway and call session control format; and
the gateway operable to convert the signaling information received from the class 5 softswitch in the media gateway and call session control format to signaling information in a broadband loop emulation service (bles) signaling protocol format, the gateway having a second interface for communicating the signaling information in the bles protocol format over a bles network, the gateway operable to provide services over the bles network including dial tone generation, hook flash detection, caller identification generation, digit collection, call progress tones, and tone detection capabilities, wherein the class 5 softswitch instructs the gateway as to which of the services to provide over the bles network via the signaling information in the media gateway and call session control format, wherein the gateway provides the services over the bles network as instructed by the class 5 softswitch, and wherein the media gateway and call session control format is a format usable by a media gateway controller to control a media gateway.
2. The system of 3. The system of 4. The system of 5. The system of 6. The system of 7. The system of 8. The system of 9. The system of 10. The system of 11. The system of 12. The system of 13. The system of 15. The method of
16. The method of
placing the voice signals into data packets for transfer to an Internet Protocol network with the signaling information to establish a call connection from a public switched telephone network user to an Internet Protocol network user and eliminate direct coupling of the class 5 softswitch to the Internet protocol network.
17. The method of
18. The method of
19. The method of
20. The method of
22. The computer readable medium of
converting the network signaling format to the media gateway and call session control format;
controlling incoming call requests from a network through the gateway according to the signaling information.
23. The computer readable medium of
converting the media gateway and call session control format to the network signaling format.
24. The computer readable medium of
25. The computer readable medium of
26. The computer readable medium of
placing the voice signals into data packets for transfer to an Internet Protocol network with the signaling information to establish a call connection from a public switched telephone network user to an Internet Protocol network user and eliminate direct coupling of the class 5 softswitch to the Internet protocol network.
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The present invention relates in general to telecommunication signal processing and more particularly to a system and method for interfacing between signaling protocols.
Conventional telecommunications systems implement broadband loop emulation services (BLES) with a variety of protocols including channel associated signaling (CAS). The BLES standard is tightly coupled to Class 5 switch protocols. However, telecommunications systems are moving toward providing Class 5 switch implementation on a workstation server with packet based distribution techniques. The workstation server implementation, also known as Class 5 softswitch, mixes broadband access with packet based information. In performing this mixing, there will be a requirement to convert the channel associated signaling or other protocol signaling to and from some sort of media gateway and call session control protocol. Currently, there is no technique to perform this function.
From the foregoing, it may be appreciated by those skilled in the art that a need has arisen for a technique to convert broadband loop emulation services signaling protocols to and from a media gateway and call session control protocol. In accordance with the present invention, a system and method for interfacing between signaling protocols are provided that substantially eliminate or greatly reduce disadvantages and problems associated with conventional telecommunications system operation.
According to an embodiment of the present invention, there is provided a system for interfacing between signaling protocols that includes a Class 5 softswitch operable to generate signaling information in a media gateway and call session control protocol. A gateway is operable to convert the media gateway and call session control protocol to a broadband loop emulation services signaling format.
The present invention provides various technical advantages over conventional telecommunications system operation. For example, one technical advantage is to provide conversion of media gateway and call session control signaling information to and from a broadband loop emulation services signaling format. Another technical advantage is to evolve the public switched telephone network to a packet based broadband distributed network. Other technical advantages may be readily apparent to those skilled in the art from the following figures, description, and claims.
For a more complete understanding of the present invention and the advantages thereof, reference is now made to the following description taken in conjunction with the accompanying drawings, wherein like reference numerals represent like parts, in which:
According to the present invention, a signaling network 24 provides signaling information in a network signaling format to a Class 5 softswitch 26. The Class 5 softswitch 26 converts the network signaling format to a media gateway and call session control format. Class 5 softswitch 26 provides the call control, feature activation control, and call accounting intelligence for telecommunications network 10. In the broadband loop emulation services proxy network architecture of telecommunications network 10, Class 5 softswitch 26 is responsible for and has the authority to accept and control both incoming call requests from the network as well as outgoing call requests from customer premises 22. Class 5 softswitch 26 utilizes network signaling to and from the network and the media gateway and call session control format to and from gateway 18 to establish and teardown subscriber calls and invoke call features on existing calls. Gateway 18 receives the media gateway and call session control format from Class 5 softswitch 26 for processing in order to provide signaling information to the BLES network 14. Examples of media gateway and call session control protocols include Signaling Gateway Control Protocol (SGCP), Media Gateway Control Protocol (MGCP), H.248, H.323, and Session Initiation Protocol (SIP) signaling standards.
In operation, Class 5 softswitch 26 receives signaling information in a network signaling format from signaling network 24. Signaling network 24 is shown using an SS7 network signaling format example but may be configured to use any of a variety of signaling protocols to include international signaling configurations such as the C7 signaling protocol and other signaling protocols such as SIP, Session Initiation Protocol for Telephones (SIP-T), Bearer Independent Call Control (BICC), and Signaling Transport (SIGTRAN). Class 5 softswitch converts the signaling information received in the network signaling format from signaling network 24 to a media gateway and call session control format. The media gateway and call session control format may be any of a variety of such formats including those specified above. The media gateway and call session control format is provided to gateway 18 for conversion to the desired broadband loop emulation service signaling protocol and passed on to IAD 20 at customer premises 22 through BLES network 14.
In order for gateway 18 to support and perform the BLES proxy signaling function, gateway 18 includes additional capabilities over and above those needed for conventional BLES operation. These capabilities include dial tone generation, hook flash detection, frequency shift keying tone detection for caller identification generation, tone detection, digit collection, and call progress tones including re-order tones, busy tones, and fast busy tones. Class 5 softswitch 26, through the signaling information, instructs gateway 18 as to which of the capabilities gateway 18 is to perform.
For reverse operation, signaling information in the broadband loop emulation service signaling format is provided to gateway 18 by IAD 20 at customer premises 22 through BLES network 14. Gateway 18 converts the broadband loop emulation service signaling format to a media gateway and call session control format. Gateway 18 provides signaling information in the media gateway and call session control format to Class 5 softswitch 26. Class 5 softswitch converts the media gateway and call session control format to a network signaling format. Signaling information in the network signaling format is provided for transfer within signaling network 24 by Class 5 softswitch 26. The present invention may accommodate any type of signaling information as alluded to above.
To eliminate a need for a signaling information link from Class 5 softswitch 26 to IADs 20, the signaling information for controlling individual pieces of telecommunications equipment coupled to IADs 20 may be processed through gateway 18. Gateway 18 provides management of signaling information between Class 5 softswitch 26 and IADs 20. Gateway 18 performs translation of the signaling information between Class 5 softswitch 26 and IADs 20. Gateway 18 will provide both the voice encoded RTP packets and the signaling information in the media gateway and call session control format to IADs 20. This technique eliminates the requirement of coupling Class 5 softswitch 26 to IP network 30. Class 5 softswitch 26 no longer needs to keep track of all IADs 20 being communicated with as this function is now off loaded to extended routing capabilities in gateway 18. The RTP packets and the signaling information are provided on separate logical paths from gateway 18 to IADs 20 and may or may not be provided on the same physical link therebetween. Thus, gateway 18 provides concentration of signaling information with voice encoded packets to destination IADs 20.
Gateway 18 also handles communications from IADs 20 to PSTN 12 and Class 5 softswitch 26. Gateway 18 may receive voice encoded RTP packets and signaling information in the media gateway and call session control format from IADs 20. Gateway 18 converts the RTP packets into voice signals for transfer to PSTN 12 over the inter-machine trunks. Gateway 18 also processes the signaling information for transfer to Class 5 softswitch 26 and ultimately to signaling network 24.
The signaling interface and concentrator features provided by gateway 18 discussed above enable service providers to deploy a softswitch architecture together with standards based voice over digital subscriber lines (VoDSL) without requiring the change out of multiple generations of IADs 20. In the first stages of VoDSL deployment, the installed base of VoDSL IADs 20 primarily support asynchronous transfer mode (ATM) based broadband loop emulation services. In order to deploy VoDSL in a next generation softswitch architecture, IADs 20 must be able to support voice over internet protocol (VoIP), MGCP, Media Gateway Control (Megaco)/H.248, SIP, among other new telephone features. This would force service providers to do a complete change out of customer premises hardware, resulting in increased costs and disruption of services. Gateway 18 allows service providers to migrate their existing network to next generation packet technologies. Gateway 18 is able to offer service providers the flexibility to deploy VoDSL in a Class 5 derived architecture, a pure softswitch architecture, or a hybrid architecture regardless of the network topology or standards based protocol enabled in IAD 20.
In summary, gateway 18 offers for example integrated northbound and southbound MGCP, H.248/Megaco, and SIP in combination with the BLES proxy feature that is able to take for example AAL2 BLES from IAD 20 and translate it to MGCP, H.248, and SIP to enable a seamless interface with a softswitch architecture. Along with the concentrator feature, the BLES proxy feature allows service providers to deploy standards based VoDSL immediately without forcing a major upgrade of customer premises equipment to migrate the network for supporting a Class 5 replacement or advanced services provided by a softswitch. The present invention makes different types of customer premises equipment appear uniform to the switching core, enabling service providers to de-couple the core network switching evolution from the access equipment.
Thus, it is apparent that there has been provided, in accordance with the present invention, a system and method for interfacing between signaling protocols that satisfies the advantages set forth above. Although the present invention has been described in detail, it should be understood that various changes, substitutions, and alterations may be readily ascertainable by those skilled in the art and may be made herein without departing from the spirit and scope of the present invention as defined by the following claims.
Parham, Eric Sean, Williams, Brian E., Carew, Anthony John Paul, Whitcher, Robert
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